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The Hotel Belmont was the first noteworthy building to stand atop Crown Hill, the present site of Belmont High School. Eventually, the hotel was abandoned, and later it was transformed into the private Belmont School for Girls. After the school was destroyed by fire, the grounds were left vacant, except for five oil wells and a pumping plant for the Los Angeles City Oil Field. On February 28, 1921, the Los Angeles Board of Education purchased the site for $100,000, for the purpose of constructing Belmont High School.

Belmont opened its doors on September 11, 1923, to about 500 students, all sophomores, and 28 faculty members. Most of the school's traditions were created by those pioneer students during the first months of the school's existence. The school newspaper conducted an election to select its name, with "Sentinel" easily winning over "Progress." To this day, Belmont's students are known as Sentinels. Those first students favored “Sentinels" because they were able to oversee the entire city from their "lookout" on Crown Hill. In another election, the school's colors, green and black, were selected over brown and white. A mosaic mural by Joseph Young is located on the wall of the main building.

Belmont High School was once the largest school in California, due to the density of the Westlake district, which it served. It was also considered the largest school in the United States, with 6,342 students. What was formerly the attendance area for Belmont High School has now become the Belmont Zone of Choice, where students have the option of attending one of nineteen small learning communities or pilot schools located on four different campuses within the zone: Belmont High School, Miguel Contreras Learning Complex, Edward Roybal Learning Center, and Ramon C. Cortines School of Visual and Performing Arts.

Belmont underwent a major modernization beginning around 2005. The school was renovated, and new paint, bathrooms, doors, walls, and ceiling tiles were added. Facilities were also updated throughout the school campus to accommodate those with special needs (for example, the addition of wheelchair ramps). From the 2010 school year, it became a 6th through 12th grade school, with Sal Castro Middle School being located on the campus. The Belmont football stadium was named for Dentler Erdmann, its long-time faculty member.

In 2011 the school was restructured, with most teachers having to reapply for their jobs. The new academic program involves learning English, Spanish, and Mandarin Chinese.[13]

The school was built for a capacity of 2,500 students, and when it opened in 1923 it had about 500 students. Due to an enrollment decline in the 1950s the Los Angeles City High School District considered closing Belmont. By the 1990s the school had its peak enrollment, 5,500 students, making it California's largest high school and one of the largest in the United States. During that period many students were reassigned to and sent on buses to schools in the San Fernando Valley because there were too many students in Belmont.[15] In the 1997-1998 school year the school had 5,160 students. At the time, the school's dropout rate was 65% and in terms of its four-year graduation rate it ranked lower than 96% of Los Angeles County high schools. 72% of the enrolled students took free lunches.[16]

The enrollment declined in the 2000s due to the opening of charter schools and LAUSD opening schools to relieve capacity. In 2001 the LAUSD began a building campaign to relieve the capacity of the school.[15]

Due to overcrowding, Belmont had a year-round schedule for 26 years, until the 2008 opening of the Edward R. Roybal Learning Center. After the opening Belmont resumed having a traditional two-year school schedule.[17]

In 2011 the school had an Academic Performance Index (API) of 639, an improvement of almost 100 points in a two-year period. Jason Song of the Los Angeles Times wrote that the score was "still poor".[13] In 2013 its API was 668, an increase of over 175 points from the 2002 figure. The State of California API goal is 800.[15]